Phthalic anhydride is the organic compound with the formula C₆H₄(CO)₂O. It is the anhydride of phthalic acid. This colourless solid is an important industrial chemical, especially for the large-scale production of plasticizers for plastics.
Specifications:

• Purity (m/m), wt%: 99.64
• Crystallizing point, 0C,min: 130.9
• Iron (Fe) (m/m), wt%: 0.000006
• Phthalic acid content, wt% , min: Absent
• Maleic anhydride (m/m), wt%, max: 0.001
• Ash (m/m), wt%, max: 0.001
• Melted products color, Hasen units, max-at output: 15
• Melted products colour after heating at 250⁰C during 90 minutes,Hasen units: At output